Shuttle motion for looms



A. E. NORRMAN SHUTTLE MOTION FOR LOOMS Filed March 5, 1921 Q Patented Dec; 7, 1926. "j

' irritan s; nons iiteit"gorl' nnsinerons; rrnnnnn.

' srrnrrnn rrlorzorr nos tooms.

n mationmeh Mai-e115, 1921, Serial i' efi iefanqjn Great Br sin m 2 9, 1920.- V

' in the other direction hen the arms zt 'a'in V 'catches is reversed. .111 the" present known and usually em-:

-('l1e1eina)fter referred to as negative 'shuttle first mentioned'negative shuttl 'n'lotions'are motion), the transference ofthe shuttleflis fmore' eomplioated. end ea'nnot work as rapobtained. by means of a'* piekmg' arrange idly as the 'negatlvemotlons. Furthermore,

ment which gives'to, the shuttleen ainountflthe positive shuttle, motion is vdivided '7 of kinetic energy sufficient to e ii'eet the rethrough the'transter otthe shuttle tr-oinone' moval ofthe shuttle irlom "one shuttle box holder into another, 'Whenfthe' veloeity of shed the" shuttle is ito the corresponding box on the other side Y the shuttle and the holders is practically ot' the loom. The shuttle isth'erehy guided zero, into two-periods with first increasing @The positive-shuttle ,motions, although ployed so-called negative shuttle m-ot oni they' removed manyofthe Qdefeetsi'of the The purpose of this invention is to obtaint'shuttle is thereloy taken over. tojthe other i 1 an improved mechanism forftransferrlng a side. The shuttle isfthen carriedpositively shuttle quickly and effectively from one Side of th-edoo'in through the shed openingv to: 'mov'e-in a. similar way and the action orlthe eta "the other' side.' l

travelsin the box. ln passing throughvthe tion 'ztnd. the retardation otthe-shuttle 1110:- I 4 guided tosome extent by. tion result in forces, that, ,eetingwon the the slay and the bottom shed on it is forced on account of "the retardation of theloomto theother. Th'e eii'ectot'the of thefsla y motion in moving backwards .iorces is especially injurious zit the moment tionot 1ts mod n for'yvards towards the ing, ar sub ected to. a

during the p'ick and the su bsequent accelerm o frtransfer'ot the" shuttle from one holder to the other, whenthe' sudden chs'ng'es cloth-fell. t v j,

" It is evident ftliat the Warp threads that if-kriots; loose en'ds', eto, V r w I p xv arp'so thet the shed cannot open properly. slo wmunmng. looms fblnltfifor special "pun,

In such a cese theshuttle will break a great poses.

number of threeds, and at the same timethe direetionof its travel willehangeu to some. =d'e'vise.animproved'gshuttle motionymeehw extent, eventually the shuttle will be thrown out of the shed entirely. A

4-;Theobjeet ofjth-e present inventionjisto Another method, for iobtziinlng the shu ttle motion is to employ positivelyjacting'mesns-I both these niechani'sms are eliminated. 111m d positively lock the carried inw'ardfltd the. middlenofft-he 'shed that transfer the shuttle. from one side of Ifother mtords the object of the invention is v which it "shuttle; change.direetioniiour times during travels and lzl'lso hy th-e reed' a ainst which a single mot on ofthe shuttlefi rom,oneside 1n spee'd result in it'phez'zvy,strain'in the meoh- "ii'nismflthat look {the ,shuttle'xtoftheholders. form the shed on wvhiel'1' t he' shuttle is mov fThese looking. means Itheref-or-e, do not 'Work I f sever-e strain, andquiteireliably. :Tl1e Wear isv'ery great and very often single thre'edsf orfgroups .of lithe .me'ehanism'cionsumes 'a-i greaotmdunt'nt threads'get broken. flh'ishappens especially p wer. Forf that reason the. positive shuttle get tangled in the motions. pare, :mostly, used only i' for l fcert ain' 11is1n, which-:oomb-inestheec'lvantages'ofthe y 1 neg nve has" well-,,as the "positive gshuttle mot ons, hutfm-Which thedisttdvantage's of the loom through the shed openin lto theff tojproduce 'armeohfanism whichhis capable/of ot-herside. .These means consist usually of. trimming .at .21 'Veiyrfas' speed and vi hieh zit the loom, that movelin oppositewdir-ections the shuttle "throu'ghthe shed 'Withoiut touchandtha't areprovidedwvith r'nezu'ls,thatearf1ng,tl-ie,warp threadsandin such a vvayv as motion. ZByZthese meansthe.shuttlefis =;first thrown out of theished. p

A further object of "the invention :is to opening? .by one of said .arms so.' thatsythe provide a shuttleinotion mechanism, which With the lock ng me ki ther shuttle and jars, so that the Wear on the mechanism Carrying .erin on holder The lookingmeans and-'the power required will be a minimum.

.ofthe first named arm are, released and 1501'- responding locking meansof theseoond .ar to provide an improved shuttle motion mechor holder areibrought int a tion. tAftet anism ofgreattsimpliditytlwithout'hooks or 1111s boihlfilms aremoyed ut y and-th catches, which griptheshttttle positively and A'still further object of the inventionis siniilarly'constructed arms onhOthsidesof: h semetime makes ,itpbssi'hletotransfer I sliuttleduringits to. make itimpossiblet for theshuttleto be i 105 shuttle is positively .lorought .-into\.oontact' is Capable ofWorking ivithoutfheavy shocks I I without any parts such as straps and pickers of leather or other material, that wearout quickly and that are subjectto changes on account of varying temperature and hu midity of the air.

. These objects are obtained in a sim ale and eilicient way by employing negative'shuttle I moving means that differ from the usually employed shuttle motion mechanisms or p ck- Qpath 'parallel to the weft through the shed opening but in opposite directions and with outtouchin the upper or lower shed. The shuttle holders are arranged similarly to the towards each other and to an amount sub-- stantlally half that ofv the shed crossing '40 I after which they move during'the second 'ing mechanisms by the fact that the shuttle is given the required veloc ty during a relatively longer tlme than is the casein the picking arrangements heretofore in use. For this purpose the stationary shuttle boxes are changed into movable shuttle holders, or carriers hereafter referred to in a generic manner asshuttle holders which enclose the shuttle or part of the same and which act .as pickers thereby transmitting the required motion to the shuttle. 'The inertia of the -movingshuttle is thereby of essential importance in transferring the shuttle from one holder to the other. In other words the kinetic energy inheren shuttle accomplishes in this invention the complete transference of the shuttle from one holder to the other without thejaid of mechanical means such as the complicated gripperand other transfer mechanisms employed in known positive shuttle motions.

The shuttle holders are guided along a present picking mechanism onejon each side of the loom and move durlng a beginning of the'motion simultaneously in the direction part of the weft or picking motion'in'a direction away from each other'back to their original positions on both sides of the loom. VZh'en the shed begins to open, the shuttle isoutside 'th-e shed in a holder. r'ts'soon as the shed is sufficiently open the shuttle holders begin to move inwards. The velocity of the holders gradually increases and the shuttle is carried forward with a corresponding'velocity in the direction toward the other sidecf the loom. After attaining a maxi; mum velocity the speed of the holders de creases to zero, when the shuttle holders have reached a position relatively close to each other-in the middle. of the shed. the holders 'move back substantially in a P similar way, so that'the velocity of the" After this holders increases to. a maximum and. decreases again to zero, as "the shuttle holders reach theiryoriginal positions outside the V shedon opposite sides of the loom. The

mechanismis thereby arranged so that, when the velocity of the shuttle holders in the inward motion is decreasing, the shuttle con with the moving,

' shed.

tinues itsymotion fo'rward'on account of its inertia with a speed, which is only sl1ghtlyless than the maximum speed of the holders depending upon the friction between the shuttle and shuttle holder; The shuttle is thus transferred from one holderinto an other while the velocity of the holders changes from decreasing velocity forwards into increasing velocity backwards. The mechanism should be so arranged, that the shuttle enters fully in the second holder afs ter the same has begun its' backward motion, so that, although the shuttle is mov- 111 with a great speed, the relative speed between the moving shuttle and moving shuttle holder is slight, so that the transfer of the shuttle from one holder to the other takes placewithout shocker jar. \Vhen the holders are returning totheir original positions the shuttle is taken over to the other side of the loom: with the latter holder.

creasing velocity the shuttle is forced on account of its kinetic energy against theholder and thus held more securely by'the same:

When the shuttle holders during the fol- Since the holder is then movin i with a delowing weft'or "picking motion are again moved the shuttle is transferred in the other direction. It will be noted that the shuttle obtains a forward and backwardmotion' with 'a varying speed that increases'and then de-' creases, the transferoftheshuttle being performed with a substantially uniform motion.

The sudden shocks that the shuttle is subjected to in the usual .pickin' motion are en tirely eliminated, and the s uttleis guided effectively and cannot be thrown out of'the During the motion the holders and the shuttle "move clear of the shed and the reed,'so that the warp threads andthe reed are not subjected toinjury or wear. Fur- ;thermore, it is evident that the shuttle mo-' tion is notdep endentof the slay motion as is the case in the present looms. Theshuttle loom frame and the: breast beam are also omitted so as notito interfere with the clearness of the drawing. V Figure 2 is an end view showing the arrangement. for guiding the shuttle holders. Only part of the frame and the most important details are shown.

Figure 3' is a section through the open shed showing the relative positions of the shuttle, shuttle holder and reed.

' 'wartl ends off th e's'huttle holders are pointedj' as Shawn, softhat in" case at tan les -'apsheds they will pushthewarp threads 'a'si'de jvitli r v least possible strai'iifo'rfinjury;' '2 indicates with an extensions which grades its res ee: ave holder along-itscentrai' lii ef daring met-shes; T e-gamin of said nQiars-c absentee, =i'

: Trigger-e is a; j'secjtio ,ing' the shuttle irfthe 1 Referring Ito the v shuttlefh'olders which are arranged parallel for 'uich Figure-tapas "View of thfe entitle; l

in larger js'cale'ishoW x H m .4 g 1 name with the" weft" and 'des'ignetlso as to enclose 1 the shuttle or apartf'qf tlie same? Themthe shuttle in the holder at rate right hand ada t n -100111,; j l i I "The Shut-file holders movementjthroifgh ings The eat-amnesia; 3 tlifer'eforef'coi'rs'titute "slidesrnovable along ft'racksb, =6 "rigidly connectec'l tofa' framefpartfo extendin -tn both sides "of. t'hej'lo positioned outside-it @WlllQlllS determined-a cord g 7 "type arisen concerned; 1 They c 0, tageously be located as indicate'd iirFigure'l' I centrally "of the v shed and warp line. allow for additional parts and'also for other e reasons the location of the tracks may even- These tracks "are" shed in man-h r to the pecific can aldvantually be altered without departing from the principle of the invention. The tracks should however be of a length suflicient to permitthe holders being eflicaciously guided during the full extent of their travel.

The tracks can be designed as shown in Figure-4. The extending portion of the holder consists of a rectangular plate"7, which is slidably mounted in slots '8 and 9,

" formed in the rigid framepart 51which exguided during its mot-ion through the shed by the slay and the reed. In this invention the shuttle does not need to be guided by these parts, and the. shuttle motion mechanisn can consequently. be designed according to other purely practical considerations 7 and eventually be entirely independent of the mechanism for transmitting the motion to the slay and reed. Accordingly the frame motion at all "egt ns'r nsf -s; so fthat a swinging motion! of the armsf' lO is transmittedats stfraight-1ine= reciprocating motion to the shuttleholders.

to allow forthenecessary mechanism for. ea e ffihe reed is or stabi i turp s a I Ch design that :is in flcf i'votfdf uponf 'pin's' 11am lateral extens n' v ctthe levers;withithe sht ttle hold'er The man fevers of the belfl-crankl levers {are coiiri e c'tejd' by means of links 15' as; the 'ai'ins Thejshtit'tle holders mov e s ymmetrically relation" each I other I hereinbefore mentioned. This motion-can afdvantagecnsly of theweft against the cloth-fell any other a y dicated" igures I I 'tliefriiotion trarfsmitted to the *shu'ttleholders by means of bellmrank levers a he li d t of "the shaft 17 is "obtained 'preferably'" by means of a continuously revolving camar- Y {the slayitselff "The flarrangement. {of the" "frame *5 as stationary -1'novable doesynot? "interferewithYthe' principleol 'thefshuttle H of ca se; understood I that "the trainee willhaveftofbe. designed so i f12"otthie"fi-ame Connectinglinks is rangement; so that a cam 19"coacting with a'f lever 20, transmits the motion to the holders r in one direction, while a cam-21coa'cting witha lever 22 transmits the motion in the other direction. ,The levers and 22 are in the usual way provided with antifriction rollers 23.. The cams 19 and 21 rotate with the shaft and thereby transmit in a simple.

and eificient way a positive motion'in both directions to theshuttle holders. The power may be transmitted .directlyto the cam-shaft or indirectly from some other revolving shaft of the loom. It will benoted'th'at the levers 14 and 16 swing in} different planes so that the connecting pieces 15 must have. joints which will permit such movement.

' On account of the shuttle belng effectively v guided by the holders during its motion through the shed. an improved arrangement shed in-the way as indicated in :Figure' 5. The holders and the shuttle are thereby made so that the shedopening is better utilizedr The motion of the heddle frames '26 and 27 and the reed "18 can thus be made smaller.

The symmetrical arrangement of the shuttle also influences the construction of the of theshuttle'c'an be obtained by giving'the same a symmetricalform in relation to; the

same. As shown in Figures 5 and 6, 2 is the f shuttle body and 28 indic'atesa cavity in the" same in which the bobbin or cop 30 is'placed y on a spindle 31 in the usual way. The weft. thread protrudes from the shuttle at 82 and the shuttle holders 1 are provided with long '4 narrow slits '33 inthe front walls so that the trudes stance steel plate, so that the power required.

- for the holder motion'may be as small as pos- To lesible. It will be noted that the shuttle should 7 enter the holder easily and be held in' thethe holder resulting from theweight ofthe eye or opening through whichthe Weft protle is in the holder.

'r e shuttle holders should emade of light and strong-material such as fo-r insame by the frictionbetweenthe shuttle and 1 shuttle. Also springer friction elements can wall ofthe shuttle holder in a manner such *that'the moving shuttle upon entering the holder would engage and force the same again st the holder wall. f Such elements would thus exert a pressure against theshuttle whichpressure would tend to :increase the friction engagement between shuttle and holder so that the shuttle is heldmore securely in place, The movement of such spring-or friction elements could advantageously be utilized for controlling mechanism for stopping the loomsuch that when I V the shuttle fails'to enter theholder; the 100m Qis automatically stopped. 1 Such stop mechanism could veryeasily be designed in princip le upon the manner employed in presentwill be left uncovered when the shut be used and such could be attachedtor the day looms taking into co nsideration the dif:

ferenc'es that 'arisejowing to theemployment I of my improved shuttle motion.

In Figure 7 of the accompanying drawings I have "diagrammatically indicated the presence of spring elements 29 which act against the shuttle in the manner indicated above;

The action of such elements'would be released at the monient'of the shuttle transfer by suitable mechanism- V Having now particularly described and ascertained the nature of my said invention,

and inwhat manner the same is to be per- V ing shuttle 'holdersfhaving extending por tion's'and adapted to engage the said guides, le'verspivotally mounted on said frame, connec-tlng means between rthe levers and the-'extending portions of the shuttle holders, a power shaft journalled'm said frame, mem:

engage said members. I i a V In witness whereofijl have hereunto signed my'name. t

an; NORRMA'N.

.bersconnecting said shaft to said levers and actuating means arranged. on sald' shaft to 

